function flexible() {
    !function (a, b) {
        function c() {
            var b = f.getBoundingClientRect().width;
            b / i > 750 && (b = 750 * i);
            var c = b / (750 / 70);
            f.style.fontSize = c + "px", k.rem = a.rem = c
        }

        var d, e = a.document, f = e.documentElement, g = e.querySelector('meta[name="viewport"]'),
            h = e.querySelector('meta[name="flexible"]'), i = 0, j = 0, k = b.flexible || (b.flexible = {});

        if (g) {
            var l = g.getAttribute("content").match(/initial\-scale=([\d\.]+)/);
            l && (j = parseFloat(l[1]), i = parseInt(1 / j))
        } else if (h) {
            var m = h.getAttribute("content");
            if (m) {
                var n = m.match(/initial\-dpr=([\d\.]+)/), o = m.match(/maximum\-dpr=([\d\.]+)/);
                n && (i = parseFloat(n[1]), j = parseFloat((1 / i).toFixed(2))), o && (i = parseFloat(o[1]), j = parseFloat((1 / i).toFixed(2)))
            }
        }

        if (!i && !j) {
            var p = (a.navigator.appVersion.match(/android/gi), a.navigator.appVersion.match(/iphone/gi)),
                q = a.devicePixelRatio;
            i = p ? q >= 3 && (!i || i >= 3) ? 3 : q >= 2 && (!i || i >= 2) ? 2 : 1 : 1, j = 1 / i
        }

        if (f.setAttribute("data-dpr", i), !g) if (g = e.createElement("meta"), g.setAttribute("name", "viewport"), g.setAttribute("content", "initial-scale=" + j + ", maximum-scale=" + j + ", minimum-scale=" + j + ", user-scalable=no"), f.firstElementChild) f.firstElementChild.appendChild(g); else {
            var r = e.createElement("div");
            r.appendChild(g), e.write(r.innerHTML)
        }

        a.addEventListener("resize", function () {
            clearTimeout(d), d = setTimeout(c, 300)
        }, !1), a.addEventListener("pageshow", function (a) {
            a.persisted && (clearTimeout(d), d = setTimeout(c, 300))
        }, !1), "complete" === e.readyState ? e.body.style.fontSize = 12 * i + "px" : e.addEventListener("DOMContentLoaded", function () {
            e.body.style.fontSize = 12 * i + "px"
        }, !1), c(), k.dpr = a.dpr = i, k.refreshRem = c, k.rem2px = function (a) {
            var b = parseFloat(a) * this.rem;
            return "string" == typeof a && a.match(/rem$/) && (b += "px"), b
        }, k.px2rem = function (a) {
            var b = parseFloat(a) / this.rem;
            return "string" == typeof a && a.match(/px$/) && (b += "rem"), b
        }
    }(window, window.lib || (window.lib = {}));
}

export {
    flexible
}
